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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2011.1075 X.Org X Server: Multiple vulnerabilities 26 October 2011 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: X.Org X Server Publisher: Gentoo Operating System: Gentoo UNIX variants (UNIX, Linux, OSX) Impact/Access: Read-only Data Access -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2011-4029 CVE-2011-4028 Original Bulletin: http://security.gentoo.org/glsa/glsa-201110-19.xml Comment: This advisory references vulnerabilities in products which run on platforms other than Gentoo. It is recommended that administrators running X.Org X Server check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201110-19 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: X.Org X Server: Multiple vulnerabilities Date: October 22, 2011 Bugs: #387069 ID: 201110-19 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities in the X.Org X server might allow local attackers to disclose information. Background ========== The X Window System is a graphical windowing system based on a client/server model. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 x11-base/xorg-server < 1.10.4-r1 *>= 1.9.5-r1 >= 1.10.4-r1 Description =========== vladz reported the following vulnerabilities in the X.Org X server: * The X.Org X server follows symbolic links when trying to access the lock file for a X display, showing a predictable behavior depending on the file type of the link target (CVE-2011-4028). * The X.Org X server lock file mechanism allows for a race condition to cause the X server to modify the file permissions of an arbitrary file to 0444 (CVE-2011-4029). Impact ====== A local attacker could exploit these vulnerabilities to disclose information by making arbitrary files on a system world-readable or gain information whether a specified file exists on the system and whether it is a file, directory, or a named pipe. Workaround ========== There is no known workaround at this time. Resolution ========== All X.Org X Server 1.9 users should upgrade to the latest 1.9 version: # emerge --sync # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.9.5-r1" All X.Org X Server 1.10 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.10.4-r1" References ========== [ 1 ] CVE-2011-4028 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4028 [ 2 ] CVE-2011-4029 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4029 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201110-19.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2011 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBTqeXAO4yVqjM2NGpAQIjhg//SnIbaOJ5aMffY1iKCIwdBTJBzMDw0Nx5 rflILnR5fbw7U9SrjNhIB9xSxcKIFeySHjt2SQBhgg0j1cu1P+bnn3jiwFOBFb7X l+72nenrdaV03tJyB3HBYGCyXbkrYHHufy4ACiNP675FGRLYeGnz85KcuNTIZ2Ey lkMjoyZ5LBU6DFkeXaNk6le8YZ/in6MZAhKglcvERpFL7+ejypbgz+uTjDfAq80+ DOmEYYBiXBqXrxn6JgHWKb7z4VEeDcNhNmKNdmLzasAC/6jtSpsg1x1N45FHc6oR oD5a7yH0E2i3M6oEbQtg5cPSQ5TYl8W5leFMBL2CCVL0OxVoBHdMM7rbZeh3eNW5 wfb32jQu+rYzqsF0Ylyw2lOqD04bQbdoJCE6psut8+IpajZ5KhszdNJB1zXsGLnQ YIInUO51nfxfQQ3fXuxaj9yU2VkstzQ6CmNW+aVpexcCE/JmiyIdWvM845FiufRZ DQYnaXhqlVOv+9D3u2zWqul52M8tpYeTA2bQEROjS81B4iBkTtNS2YVlLNvu34nv RhvEFlZWQyxP3gRGt0llE2AqFpt15ZM5GnjOUgCXbgkAyZuWGVeIJhxg90tWV5kM HQ/ac/Tl4rUTmAMcUYtSfdoLwQ7PWlAXTs7zpCOfO5tejWK7fErcETqg+4Eq9Qv+ DxsAWGRlBmM= =9Kn9 -----END PGP SIGNATURE-----